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Segment Information - Income Tax Expense (Benefit) by Segment (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Segment Information: Income tax expense (benefit) |  |  |
Income taxes (benefits) | $ 291.7 | $ 68.7 | $ 1,189.5
Operating Segments |  |  |
Segment Information: Income tax expense (benefit) |  |  |
Income taxes (benefits) | 364.5 | 407.1 | 343.9
Reconciling items |  |  |
Segment Information: Income tax expense (benefit) |  |  |
Tax benefit related to net realized capital losses, as adjusted | (16.1) | (22.0) | (56.6)
Tax benefit from exited business (1) | 17.6 | (238.1) | 956.4
Certain adjustments related to equity method investments and noncontrolling interest | (74.3) | (78.3) | (54.2)
Retirement and Income Solutions | Operating Segments |  |  |
Segment Information: Income tax expense (benefit) |  |  |
Income taxes (benefits) | 129.3 | 130.9 | 90.6
Principal Asset Management | Operating Segments |  |  |
Segment Information: Income tax expense (benefit) |  |  |
Income taxes (benefits) | 230.8 | 220.7 | 213.3
Benefits and Protection | Operating Segments |  |  |
Segment Information: Income tax expense (benefit) |  |  |
Income taxes (benefits) | 89.0 | 97.7 | 109.1
Corporate | Operating Segments |  |  |
Segment Information: Income tax expense (benefit) |  |  |
Income taxes (benefits) | $ (84.6) | $ (42.2) | $ (69.1)

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